mirror of https://github.com/ecmwf/eccodes.git
60 lines
1.7 KiB
Modula-2
60 lines
1.7 KiB
Modula-2
# (C) Copyright 2005- ECMWF.
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# SECTION 6, BIT-MAP SECTION
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position offsetSection6;
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position offsetBSection6;
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section_length[4] section6Length ;
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meta section6 section_pointer(offsetSection6,section6Length,6);
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# Number of section
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unsigned[1] numberOfSection = 6:read_only;
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# Bit-map indicator
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codetable[1] bitMapIndicator ('6.0.table',masterDir,localDir) = 255 : dump;
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#transient bitmapPresent=1;
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meta geography.bitmapPresent g2bitmap_present(bitMapIndicator): dump;
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transient missingValuesPresent = bitmapPresent : hidden, read_only;
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# Bitmap...
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if (bitMapIndicator == 0) {
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if (dataRepresentationTemplateNumber == 1) {
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if (matrixBitmapsPresent == 1) {
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meta primaryBitmap g2bitmap( tableReference,
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missingValue,
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offsetBSection6,
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section6Length,
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numberOfDataMatrices) : read_only;
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}
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else {
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meta geography.bitmap g2bitmap( tableReference,
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missingValue,
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offsetBSection6,
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section6Length,
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numberOfDataPoints) : read_only;
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}
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}
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else {
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meta geography.bitmap g2bitmap( tableReference,
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missingValue,
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offsetBSection6,
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section6Length,
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numberOfDataPoints) : read_only;
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}
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}
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if (bitMapIndicator == 255)
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{
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# No bitmap is used but some complex packing schemes embed the missing values in the data section
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if (dataRepresentationTemplateNumber == 2 || dataRepresentationTemplateNumber == 3) {
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transient missingValuesPresent = (missingValueManagementUsed != 0) : read_only;
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}
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if (dataRepresentationTemplateNumber == 200) {
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# This template can have undefined values within its Data Section
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transient missingValuesPresent = 1;
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}
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}
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meta md5Section6 md5(offsetSection6,section6Length);
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